Description GtkOffscreenWindow is strictly intended to be used for obtaining snapshots of widgets that are not part of a normal widget hierarchy. It differs from gtk_widget_get_snapshot() in that the widget you want to get a snapshot of need not be displayed on the user's screen as a part of a widget hierarchy. However, since GtkOffscreenWindow is a toplevel widget you cannot obtain snapshots of a full window with it since you cannot pack a toplevel widget in another toplevel. The idea is to take a widget and manually set the state of it, add it to a GtkOffscreenWindow and then retrieve the snapshot as a GdkPixmap or GdkPixbuf. GtkOffscreenWindow derives from GtkWindow only as an implementation detail. Applications should not use any API specific to GtkWindow to operate on this object. It should be treated as a GtkBin that has no parent widget. When contained offscreen widgets are redrawn, GtkOffscreenWindow will emit a "damage-event" signal.